Anthony Bruno died of his injuries in the shooting outside a downtown hotel on Dec. 1.

Officer Don Hubbard told investigators that if he had not used deadly force in this case, he was afraid Bruno would have killed him.

Hubbard had been off duty on the night of the shooting, working security for the Marriott hotel. He responded to a report of a fight going on between some people and a cab driver.

According to the police report, Bruno was attacking the cab driver in a dispute over a fare, but he ran away when Hubbard arrived. Hubbard chased Bruno through alleyways and caught up with him between 12th and 13th streets and Baltimore Avenue.

The video shows Hubbard attempting to arrest Bruno, pleading with a group of bystanders who had recorded the incident on a cellphone to call for help.

Ashely Janzen said her friend made the phone recording.

"At the beginning of the situation, we were just thinking, 'Oh, cop, calm down. This doesn't need to get out of hand,'" she said.

Hubbard told detectives that Bruno flipped him over and said, 'You shouldn't have hit me," and then continued to punch him.

"He continued to strike me and I started to lose consciousness, and I believed the suspect was not going to stop hitting me until he killed me," Hubbard told investigators.

Hubbard said he started to black out from blows to the head and decided to take out his gun and fire two shots at the center of Bruno's body.

Janzen, a critical care nurse, said the shots made her nurse mode kick in.

"All you want to do is save somebody's life, and so you just go," she said.

She started to perform CPR. She said she told police that Bruno pleaded with her not to let him die.

"If maybe he would have just accepted being detained, none of this would have happened," she said.

Earlier this month, a Jackson County grand jury decided not to pursue charges of second-degree murder and armed criminal action against Hubbard.

NEWLY RELEASED VIDEO SHOWS THE MOMENTS BEFORE AN OFF DUTY KANSAS CITY POLICE OFFICER SHOT AND KILLED FIREFIGHTER, ANTHONY BRUNO. THE OFFICER HAS BEEN CLEARED OF CHARGES. TONIGHT, A WITNESS WHO TRIED SAVING BRUNO'S LIFE SPEAKS TO OUR HALEY HARRISON ABOUT WHAT SHE SAW...HALEY? ASHLEY JANZEN AND A FRIEND WERE HEADED HOME FROM A DOWNTOWN BAR DECEMBER FIRST WHEN THEY SAW BRUNO AND POLICE OFFICER DON HUBBARD STRUGGLING ON THE SIDEWALK. JANZEN SAYS THAT'S WHEN HER FRIEND TOOK OUT A CELL PHONE AND STARTED RECORDING. ((NATS) ) WATCHING THIS...JANZEN DIDN'T KNOW MOMENTS LATER MANY LIVES WOULD CHANGE -- AND ONE WOULD BE LOST. ((SURVEILLANCE VIDEO) ) IT ALL STARTED MINUTES EARLIER OUTSIDE THE DOWNTOWN MARRIOTT...WHERE BRUNO AND HIS NEW BRIDE GOT INTO AN ARGUMENT WITH A CAB DRIVER. REPORTS SAY BRUNO GOT VIOLENT AND RAN WHEN HUBBARD ARRIVED. DON HUBBARD, AN OFF DUTY KANSAS CITY OFFICER STRUGGLES TO ARREST ANTHONY BRUNO. ((GRAPHIC) ) ACCORDING TO A NEWLY RELEASED STATEMENT -- HUBBARD SAYS AT ONE POINT -- BRUNO TELLS HIM, "YOU SHOULDN'T HAVE HIT ME." ((NATS - DON'T FIGHT THE COP) ) VIDEO SHOWS AS BRUNO PINS HUBBARD TO THE CONCRETE REPEATEDLY HITING HIM. ((GRAPHIC - "HALEY HUBBARD STATEMENT") ) HUBBARD SAYS ... "HE CONTINUED TO STRIKE ME AND I STARTED TO LOSE CONSCIOUSNESS AND I BELIEVED THE SUSPECT WAS NOT GOING TO STOP HITTING ME UNTIL HE KILLED ME." THEN, HUBBARD SHOT BRUNO TWICE. ((NATS - AFTER SHOTS) ) JANZEN, CRITICAL CARE NURSE STARTED C-P-R. SHE TOLD POLICE BRUNO PLEADED "DON'T LET ME DIE." BRUNO'S WIDOW, STEPHANIE TELLS POLICE THEY HAD BEEN DRINKING AT THEIR WEDDING RECEPTION. BUT SHE BELIEVES HER HUSBAND RAN FROM HUBBARD TO "COOL OFF" FROM THE DISAGREEMENT WITH THE CABBIE. JANZEN SAYS THE INCIDENT HAS GIVEN HER NEW RESPECT FOR POLICE. LIVE, HALEY HARRISON, KMBC NINE NEWS.